Q) Describe the roles of the rough endoplasmic reticulum, mitochondria and ribosomes
Main points | |
Key idea: | Functions of rough endoplasmic reticulum (rER) |
Fn : Transport of protein synthesized by ribosomes attached to its surface · Proteins leave ER throu transport vesicles that pinched off fr membr, to various destinations within cell or exported out (exocytosis) · Proteins may be transported to Golgi body, modified before reaching their final destinations | |
Key idea: | Functions of mitochondria |
Fn : Syn of ATP · Pyruvate (fr glycolysis) enters mitoch, form acetyl CoA + NADH · Acetyl CoA enters Krebs cycle, form more NADH + FADH2 + ATP (substrate level phosphorylation) · NADH + FADH2 transported to inner mitoch membr, form most ATP (via oxidative phosphorylation) per glucose during cellular resp | |
Key idea: | Functions of ribosomes |
Fn : Syn of polypep using mRNA as template · Ribo positions mRNA, tRNA, other protein factors to form complex for translation · Peptidyl transferase (of large ribo subunit) form peptide bonds b/w adj aa | |
Comments: (i) Visualize the answer with the aid of labelled pictures of the organelles (refer to URL provided) (ii) Verbalize the answer + write down the main points w/o referring to the answer (use abbreviations) (iii) Read again within the next 24h & once more within 72h (do not spend more than 10min) | |
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